Wrong user changed the file

[Codename-agent]

Dear support,

I have an issue with Nextcloud and Onlyoffice installed on UCS (completed VMware img). The cloud storrage is working ok but with shared files from Administrator when someone for example, userX or userY changed/edited some files (xlsx, docx) the file in the activity shown "You (Administrator) changed file". All files and folders with changes, are made from Administrator but this is false. How can I fix this?

I use: Version NextCloud 21.0.4 with lastest Onlyoffice and Activity app again last version.

Thank you in advance. Best regards, Nikolai.